Journal ArticleDOI
Orbital Physics in Transition-Metal Oxides
Yoshinori Tokura,Naoto Nagaosa +1 more
Reads0
Chats0
TLDR
An overview is given here on this "orbital physics," which will be a key concept for the science and technology of correlated electrons.Abstract:
An electron in a solid, that is, bound to or nearly localized on the specific atomic site, has three attributes: charge, spin, and orbital. The orbital represents the shape of the electron cloud in solid. In transition-metal oxides with anisotropic-shaped d-orbital electrons, the Coulomb interaction between the electrons (strong electron correlation effect) is of importance for understanding their metal-insulator transitions and properties such as high-temperature superconductivity and colossal magnetoresistance. The orbital degree of freedom occasionally plays an important role in these phenomena, and its correlation and/or order-disorder transition causes a variety of phenomena through strong coupling with charge, spin, and lattice dynamics. An overview is given here on this "orbital physics," which will be a key concept for the science and technology of correlated electrons.read more
Citations
More filters
Journal ArticleDOI
Electronic structure and polaronic excitation in FeVO4
TL;DR: In this paper, the authors investigated the electronic properties of FeVO4 films using optical, valence band x-ray photoelectron, and infrared spectroscopies, and they showed that it is a direct bandgap system with a 2.7 ǫ-eV gap with the Fermi level in the middle of the maximum and conduction band minimum.
Journal ArticleDOI
Non-perturbative V-Jpd model and ferromagnetism in dilute magnets
TL;DR: In this article, the magnetic couplings in the V−Jpd model for dilute magnets are calculated non-perturbatively and disorder in the configuration of impurities is treated exactly, allowing to test the validity of effective medium theories.
Journal ArticleDOI
Universal thermodynamics of an SU($N$) Fermi-Hubbard Model
Eduardo Ibarra-García-Padilla,Sohail Dasgupta,Hao-Tian Wei,Shintaro Taie,Yoshiro Takahashi,Richard T. Scalettar,Kaden R. A. Hazzard +6 more
TL;DR: In this article, the authors study thermodynamic properties of the SU$N$ Fermi-Hubbard model in 2D square lattices and discover simple scaling laws of the energy, the number of on-site pairs, and the kinetic energy with respect to $N$ when the temperature is above the superexchange energy.
Journal ArticleDOI
High-pressure neutron diffraction studies at LANSCE
Yusheng Zhao,Jianzhong Zhang,Hongwu Xu,Konstantin A. Lokshin,Duanwei He,Jiang Qian,Cristian Pantea,Luke L. Daemen,Sven C. Vogel,Yang Ding,Jian Xu +10 more
TL;DR: The development of high-pressure neutron diffraction under extreme pressure (P) and temperature (T) conditions is highly valuable to condensed matter physics, crystal chemistry, materials science, and earth and planetary sciences as discussed by the authors.
Journal ArticleDOI
Inelastic X-ray Scattering Studies of Electronic Excitations
TL;DR: Inelastic x-ray scattering (IXS) has developed into one of the most powerful momentum-resolved spectroscopies for strongly correlated electron systems, where the interplay of charge, spin, and orbital degrees of freedom determines their physical properties as discussed by the authors.
References
More filters
Journal ArticleDOI
Interaction between the d -Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure
TL;DR: In this paper, it was shown that both electrical conduction and ferromagnetic coupling in these compounds arise from a double exchange process, and a quantitative relation was developed between electrical conductivity and the Ferromagnetic Curie temperature.
Journal ArticleDOI
Theory of the role of covalence in the perovskite-type manganites [La,M(II)]MnO3
TL;DR: In this article, the theory of double exchange was applied to perovskite-type manganites and detailed qualitative predictions about the magnetic lattice, the crystallographic lattice and the electrical resistivity were made.
Journal ArticleDOI
Stability of Polyatomic Molecules in Degenerate Electronic States. I. Orbital Degeneracy
H. A. Jahn,Edward Teller +1 more
TL;DR: In this paper, it was shown that if the total electronic state of orbital and spin motion is degenerate, then a non-linear configuration of the molecule will be unstable unless the degeneracy is the special twofold one (discussed by Kramers 1930) which can occur only when the molecule contains an odd number of electrons.
Journal ArticleDOI
Superexchange interaction and symmetry properties of electron orbitals
TL;DR: In this article, the sign of the superexchange interaction is closely connected with the symmetry of the electron orbitals and the cation orbital state when the cations are subject to the crystalline field arising from octahedral or tetrahedrally surrounding anions.